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Isn’t PCIe a little slow compared to (say) qpi? Won’t this just mean you’re waiting on memory more often?
by swiley 7y ago
Isn’t PCIe a little slow compared to (say) qpi? Won’t this just mean you’re waiting on memory more often?
- _bxg1 7y agoPresumably it's a case where the speed has gotten fast enough that we can sacrifice some of it for other benefits
- simcop2387 7y agoI think this has the memory on board the CPU card, so it shouldn't affect anything there. What i'd be worried about is the total number of pci-e lanes exposed by the slot for the cpu, that'll bottleneck most systems these days thanks to nvme storage and other peripherals.
- rbanffy 7y agoPOWER is getting there. Their OpenCAPI stuff allows one to attach all kinds of stuff, from coprocessors to memory. Large boxes will end up having separate connected CPU and memory drawers on the rack. But that's no desktop computer.
- blattimwind 7y agoQPI/UPI is not used in single processor systems. DMI is literally PCIe. You would however need quite a number of PCIe lanes to achieve the bandwidth of a 128 bit DDR4/5 interface.